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We average between 7 and 8 on our 81 Class C driving under 60mph with a 350 Chevy and carburetor.
It's usually closer to 7 than it is to 8, so It sounds like you're about right.
Terrain and road speed seem to be the factors that determine the fuel mileage in these beasts.
Honestly, I hardly even check it anymore, it's been consistently getting 7 mpg for the 3 years we've owned it with varied driving conditions and techniques. I have accepted that it's the best I'm ever going to get with it.

It seem pretty bad. were new at this we just bought our first 24 foot rv ford 460. just wondering what to expect

Nobody said it was cheap. Add up your fuel costs + CG fees and compare that to Hotel + Resturant Meals + Fuel for the car. Pretty close to the same thing BUT, you can park where you want. Welcome to RV'ing. There is a price attached to everything.

I think around 7MPG. is about par for any motorhome,When someone tells me he's getting 10-11, I suspect he's embelishing,or checking his mileage east bound from Albuquerque to Okie City.( That means downhill with a tailwind,)

We have an 1984 27' Winnebago Chieftain with a Chevy 454. When we first got it, it had sat for a while and we would get around 5.5-6mpg. Quite a few trips, many tanks of gas with a high amount of fuel system cleaner and a tune up later and we average 9mpg highway and about 7.5mpg city. We do more highway driving, our overall average mileage is around 8.25mpg.